browser: add support for sorting by mtime in local browser

src/browser.cpp

@@ -498,7 +498,10 @@ void Browser::GetLocalDirectory(MPD::ItemList &v, const std::string &directory,
 			item.song = std::shared_ptr<MPD::Song>(s);
 #			ifdef HAVE_TAGLIB_H
 			if (!recursively)
+			{
+				s->setMTime(fs::last_write_time(e.path()));
 				Tags::read(*s);
+			}
 #			endif // HAVE_TAGLIB_H
 			v.push_back(item);
 		}

src/mutable_song.cpp

@@ -160,12 +160,24 @@ unsigned MutableSong::getDuration() const
 		return Song::getDuration();
 }
 
+time_t MutableSong::getMTime() const
+{
+	if (m_mtime > 0)
+		return m_mtime;
+	else
+		return Song::getMTime();
+}
 
 void MutableSong::setDuration(unsigned int duration)
 {
 	m_duration = duration;
 }
 
+void MutableSong::setMTime(time_t mtime)
+{
+	m_mtime = mtime;
+}
+
 void MutableSong::setTags(SetFunction set, const std::string &value, const std::string &delimiter)
 {
 	std::vector<std::string> tags;

src/mutable_song.h

@@ -30,8 +30,8 @@ struct MutableSong : public Song
 {
 	typedef void (MutableSong::*SetFunction)(const std::string &, unsigned);
 	
-	MutableSong() : m_duration(0) { }
-	MutableSong(Song s) : Song(s), m_duration(0) { }
+	MutableSong() : m_mtime(0), m_duration(0) { }
+	MutableSong(Song s) : Song(s), m_mtime(0), m_duration(0) { }
 	
 	virtual std::string getArtist(unsigned idx = 0) const;
 	virtual std::string getTitle(unsigned idx = 0) const;
@@ -61,7 +61,9 @@ struct MutableSong : public Song
 	void setNewURI(const std::string &value);
 	
 	virtual unsigned getDuration() const;
+	virtual time_t getMTime() const;
 	void setDuration(unsigned duration);
+	void setMTime(time_t mtime);
 	
 	void setTags(SetFunction set, const std::string &value, const std::string &delimiter);
 	
@@ -103,6 +105,7 @@ private:
 	}
 	
 	std::string m_uri;
+	time_t m_mtime;
 	unsigned m_duration;
 	std::map<Tag, std::string> m_tags;
 };